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TextChangedEventArgs Class
 

Provides data for the TextChanged event.

Namespace:   System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)

SystemObject
   SystemEventArgs
     System.WindowsRoutedEventArgs
      System.Windows.ControlsTextChangedEventArgs

public class TextChangedEventArgs : RoutedEventArgs
public ref class TextChangedEventArgs : RoutedEventArgs
type TextChangedEventArgs = 
    class
        inherit RoutedEventArgs
    end
Public Class TextChangedEventArgs
	Inherits RoutedEventArgs
NameDescription
System_CAPS_pubmethod TextChangedEventArgs

Initializes a new instance of the TextChangedEventArgs class, using the specified event ID and undo action.

System_CAPS_pubmethod TextChangedEventArgs

Initializes a new instance of the TextChangedEventArgs class, using the specified event ID, undo action, and text changes.

NameDescription
System_CAPS_pubproperty

Gets a collection of objects that contains information about the changes that occurred.

System_CAPS_pubproperty

Gets or sets a value that indicates the present state of the event handling for a routed event as it travels the route. (Inherited from RoutedEventArgs.)

System_CAPS_pubproperty

Gets the original reporting source as determined by pure hit testing, before any possible adjustment by a parent class.(Inherited from RoutedEventArgs.)

System_CAPS_pubproperty

Gets or sets the associated with this RoutedEventArgs instance. (Inherited from RoutedEventArgs.)

System_CAPS_pubproperty

Gets or sets a reference to the object that raised the event. (Inherited from RoutedEventArgs.)

System_CAPS_pubproperty

Gets how the undo stack is caused or affected by this text change

NameDescription
System_CAPS_pubmethod Equals

Determines whether the specified object is equal to the current object.(Inherited from Object.)

System_CAPS_protmethod Finalize

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)

System_CAPS_pubmethod GetHashCode

Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethod GetType

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_protmethod InvokeEventHandler

Performs the proper type casting to call the type-safe TextChangedEventHandler delegate for the TextChanged event.(Overrides RoutedEventArgsInvokeEventHandler.)

System_CAPS_protmethod MemberwiseClone

Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_protmethod OnSetSource

When overridden in a derived class, provides a notification callback entry point whenever the value of the property of an instance changes.(Inherited from RoutedEventArgs.)

System_CAPS_pubmethod ToString

Returns a string that represents the current object.(Inherited from Object.)

The following example displays the number of times the text in a TextBox changes. Below is the XAML code for the example.

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"    
  x:Class="SDKSample.DetectChangedTextExample"
  Title="DetectChangedText">
  <StackPanel>
    <TextBox
      Name="tbCountingChanges"    
      TextChanged="textChangedEventHandler"
      TextWrapping="Wrap">
      Here is the initial text in the textbox.  Each time the contents of this box is changed, a change counter will
      be incremented and displayed in the TextBox below.  Note that the TextChanged event is called when the TextBox
      control is initially populated with text, so the changes counter starts of at 1.
    </TextBox>
    <TextBox Name="tbCounterText">0</TextBox>

  </StackPanel>  
</Page>

Below is the code behind for the example.

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;

namespace SDKSample
{

    public partial class DetectChangedTextExample : Page
    {

        // This is a counter for the number of times the TextChanged fires
        // for the tbCountingChanges TextBox.
        private int uiChanges = 0;

        // Event handler for TextChanged Event.
        private void textChangedEventHandler(object sender, TextChangedEventArgs args)
        {

            uiChanges++;
            if (tbCounterText != null)
            {
                tbCounterText.Text = uiChanges.ToString();
            }

        }
    }
}

Namespace SDKSample

    Partial Public Class DetectChangedTextExample
        Inherits Page

        ' This is a counter for the number of times the TextChanged fires
        ' for the tbCountingChanges TextBox.
        Private uiChanges As Integer = 0

        ' Event handler for TextChanged Event.
        Private Sub textChangedEventHandler(ByVal sender As Object,
                                            ByVal args As TextChangedEventArgs)

            uiChanges += 1
            If tbCounterText IsNot Nothing Then
                tbCounterText.Text = uiChanges.ToString()
            End If

        End Sub
    End Class
End Namespace
.NET Framework
Available since 3.0
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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